Nuclear power can generate electricity without greenhouse gas emissions. However, there are concerns about its safety. Learn about the safety and health concerns associated with the threat of nuclear meltdowns, as well as the challenges involved in storing radioactive waste.he isotope U-235 is important because it can be used in the nuclear fission chain reaction to create a lot of energy. Unlike the uranium used in a nuclear bomb, which is about 90% enriched with the isotope U-235, the uranium used in a nuclear reactor is only slightly enriched, to about four or five percent.
1 Professional sod installation typically costs $500 to $1,000 for a 2,000 sq. ft. or smaller lawn. 2  Per square foot installation costs average $.50 to $1.00. 3  Installing sod on smaller lawns tends to cost more per square foot.
1 Professionally installed sod typically costs 14 cents - 60 cents a square foot, or $280-$1,000 for front and back lawns of 2,000 square feet. 2  A professionally installed underground sprinkler system typically costs $1,500-$2,500 for 2,500 square feet (a 50'x50' yard), depending on location and climate. For example, mowing an average-sized residential lawn typically costs $20-$40, while a weekly garden service can cost $65-$90 for mowing, leaf blowing, hedging and shrub trimming as needed.